冶炼前期转炉渣熔体结构的转变行为

张蕊,闵义,王宇,刘承军

钢铁 ›› 2019, Vol. 54 ›› Issue (7) : 30-34.

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钢铁 ›› 2019, Vol. 54 ›› Issue (7) : 30-34. DOI: 10.13228/j.boyuan.issn0449749x.20180432
炼钢

冶炼前期转炉渣熔体结构的转变行为

  • 张蕊1,2,闵义1,2,王宇1,2,刘承军1,2
作者信息 +

Structural transformation of converter slags during #br# early stage of smelting process

  • 张蕊1,2,闵义1,2,王宇1,2,刘承军1,2
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摘要

为了更好地理解熔渣结构对转炉渣设计及物理性质控制的重要性,模拟了转炉冶炼前期熔渣的化学成分,采用Raman光谱测定了CaOSiO2FexO系试验渣的熔体结构,解析了熔渣中结构单元的存在形式及其演变行为。结果表明,转炉冶炼前期,随着冶炼的进行,熔渣碱度逐渐升高,渣中增加的自由O2-破坏了复杂的硅酸盐结构,发生由Q3→Q2→Q1→Q0的解聚过程,导致熔渣聚合度随冶炼时间的延长呈下降的趋势;同时随着冶炼的进行,渣中Fe3+/∑Fe减小,使得[FeO4]5-四面体相对面积分数逐渐增加,[FeO6]9-八面体相对面积分数逐渐减少。

Abstract

In order to understand the importance of the effect of the slag structure composition on the design of converter slag and the rationalizing of the physical property of the smelting process better, the chemical composition of the molten slag during the early stage of the converter steelmaking process was simulated. Then, the melt structure of CaOSiO2FexO slag was investigated by the Raman spectroscopy, and the existing forms and transformational behaviors of structural units in the molten slag were further analyzed. The results show that the basicity of the molten slag increases with the converter steelmaking proceeding. Plenty of free oxygen ions are released by the elevating basicity, which depolymerizes complex silicate structures. The depolymerization process is Q3→ Q2→ Q1→ Q0, resulting in the reduction of the polymerization degree of the molten slag with the smelting time. Meanwhile, as the converter smelting proceeds, the [FeO6]9- octahedron was gradually replaced by the [FeO4]5- tetrahedron due to the decreasing of the Fe3+/∑Fe in the slag.

关键词

转炉渣 / 冶炼前期 / 熔体结构 / 转变行为 / Raman光谱

Key words

convert slag / initial melting period / melt structure / transformational behavior / Raman spectra

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张蕊, 闵义, 王宇, . 冶炼前期转炉渣熔体结构的转变行为[J]. 钢铁, 2019, 54(7): 30-34 https://doi.org/10.13228/j.boyuan.issn0449749x.20180432
ZHANG Rui, MIN Yi, WANG Yu, et al. Structural transformation of converter slags during #br# early stage of smelting process[J]. Iron and Steel, 2019, 54(7): 30-34 https://doi.org/10.13228/j.boyuan.issn0449749x.20180432

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